body{
  margin: 0;
  padding: 0;
  display: flex;
  justify-content:center;
  align-items: center;
  min-height: 100vh;
  background: #060c21;
  font-family: 'poppins',sans-serif;
}
.box{
  position: relative;
  width: 300px;
  height: 400px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #060c21;
}
.box:before{
  content:'';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background:#fff;
  z-index:-1;
}
.box:after{
  content:'';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background:#fff;
  z-index:-2;
  filter: blur(40px);
}
.box:before,
.box:after{
  background:linear-gradient(235deg,#89ff00,#060c21,#00bcd4);
}
.content{
  padding: 20px;
  box-sizing: border-box;
  color:#fff;
  
}